265. Exploring network interfaces

In Java, a network interface is represented by the NetworkInterface API. Basically, a network interface is identified by a name and a list of IPs that are assigned to it. Via this information, we can associate a network interface with different network tasks such as a multicast group.

The following snippet of code lists all network interfaces that are available on your machine:

public class Main {
  public static void main(String[] args) 
         throws SocketException {
    Enumeration allNetworkInterfaces
      = NetworkInterface.getNetworkInterfaces();
    while (allNetworkInterfaces.hasMoreElements()) {
      NetworkInterface ni = (NetworkInterface) 
        allNetworkInterfaces.nextElement();
      System.out.println("\nDisplay Name: " 
        + ni.getDisplayName());
      System.out.println(ni.getDisplayName() 
        + " is up and running ? " + ni.isUp());
      System.out.println(ni.getDisplayName() 
       ...